[PATCH] at91_rtc updates

Various bug fixes to the at91rm9200 RTC:

 - alarm:  setalarm() should pay attention to the "enabled" flag

 - init:  cleaner handling of the wakeup flags, which cpu init should
   really have set up.  Doing it here is just a workaround.

 - linkage:  since the at91_rtc driver probe() routine is in the init
   section, it should use platform_driver_probe() instead of leaving
   that pointer around in the driver struct after init section removal.

 - linkage:  likewise, remove() belongs in the exit section.

Among other things, the init and alarm changes ensure that this driver
handles the new sysfs "wakealarm" attribute properly.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 6 deletions

diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index a724ab49a797..ac0e68e2f025 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -164,6 +164,7 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
         tm.tm_min = alrm->time.tm_min;
         tm.tm_sec = alrm->time.tm_sec;
 
+        at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
         at91_sys_write(AT91_RTC_TIMALR,
                   BIN2BCD(tm.tm_sec) << 0
                 | BIN2BCD(tm.tm_min) << 8
@@ -174,6 +175,9 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
                 | BIN2BCD(tm.tm_mday) << 24
                 | AT91_RTC_DATEEN | AT91_RTC_MTHEN);
 
+        if (alrm->enabled)
+                at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
+
         pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
                 at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
                 tm.tm_min, tm.tm_sec);
@@ -303,6 +307,12 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
                 return ret;
         }
 
+        /* cpu init code should really have flagged this device as
+         * being wake-capable; if it didn't, do that here.
+         */
+        if (!device_can_wakeup(&pdev->dev))
+                device_init_wakeup(&pdev->dev, 1);
+
         rtc = rtc_device_register(pdev->name, &pdev->dev,
                                 &at91_rtc_ops, THIS_MODULE);
         if (IS_ERR(rtc)) {
@@ -310,7 +320,6 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
                 return PTR_ERR(rtc);
         }
         platform_set_drvdata(pdev, rtc);
-        device_init_wakeup(&pdev->dev, 1);
 
         printk(KERN_INFO "AT91 Real Time Clock driver.\n");
         return 0;
@@ -319,7 +328,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 /*
  * Disable and remove the RTC driver
  */
-static int __devexit at91_rtc_remove(struct platform_device *pdev)
+static int __exit at91_rtc_remove(struct platform_device *pdev)
 {
         struct rtc_device *rtc = platform_get_drvdata(pdev);
 
@@ -331,7 +340,6 @@ static int __devexit at91_rtc_remove(struct platform_device *pdev)
 
         rtc_device_unregister(rtc);
         platform_set_drvdata(pdev, NULL);
-        device_init_wakeup(&pdev->dev, 0);
 
         return 0;
 }
@@ -404,8 +412,7 @@ static int at91_rtc_resume(struct platform_device *pdev)
 #endif
 
 static struct platform_driver at91_rtc_driver = {
-        .probe          = at91_rtc_probe,
-        .remove         = at91_rtc_remove,
+        .remove         = __exit_p(at91_rtc_remove),
         .suspend        = at91_rtc_suspend,
         .resume         = at91_rtc_resume,
         .driver         = {
@@ -416,7 +423,7 @@ static struct platform_driver at91_rtc_driver = {
 
 static int __init at91_rtc_init(void)
 {
-        return platform_driver_register(&at91_rtc_driver);
+        return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe);
 }
 
 static void __exit at91_rtc_exit(void)